Should Basement weight be considered for Seimic weight?
Should Basement weight be considered for Seimic weight?
(OP)
I have a 4 basement with G+11 storey structure, in a moderate seismic zone.
I have considered the superstructure height from the ground level to determine my time period and considered only the weight of the Superstructure to calculate my base shear. The basement footprint is larger than the building tower footprint, and is surrounded by stiff retaining walls. The soil is fairly rigid, SBC of 450 kN/m^2 at 15m(bottom of raft)
My question is: Should I consider the weight of the basement slabs to be part of my seismic weight? Any references plz?
I have considered the superstructure height from the ground level to determine my time period and considered only the weight of the Superstructure to calculate my base shear. The basement footprint is larger than the building tower footprint, and is surrounded by stiff retaining walls. The soil is fairly rigid, SBC of 450 kN/m^2 at 15m(bottom of raft)
My question is: Should I consider the weight of the basement slabs to be part of my seismic weight? Any references plz?






RE: Should Basement weight be considered for Seimic weight?
With a significant podium, or certain soil conditions, you should be designing your foundation walls for seismic loading. Still does not make the foundation and portions of the structure which are underground part of the seismic weight.
Any design example for your loadings code should show this... Where are you, and what code are you using?
RE: Should Basement weight be considered for Seimic weight?
Thanks for starting this thread. I'll be monitoring it's progress with great interest.
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: Should Basement weight be considered for Seimic weight?
Kootk, that statement confuses me a bit. Are you saying that you model it with one or more zero-weight stories?
RE: Should Basement weight be considered for Seimic weight?
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: Should Basement weight be considered for Seimic weight?
RE: Should Basement weight be considered for Seimic weight?
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I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: Should Basement weight be considered for Seimic weight?
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.